The rat ex-hubby of Mob Wives starlet Renee Graziano was hit with ​just ​11 years in prison Wednesday for his role in the murder of a Brooklyn man during a botched 2010 robbery.

Hulking hoodlum Hector Pagan ​– who could have gotten life behind bars — ​was cut a break on the murder rap because he served as a “significant” government cooperator who helped topple a slew of Bonanno bigs, Brooklyn federal prosecutors said.

Along with Bonanno associates Luigi Grasso and Richard Riccardi, Pagan ambushed James Donovan at his Gravesend check cashing business in July 2010 and shot him dead as he tried to flee the scene.

The slain man’s shattered daughter pleaded with Judge John Gleeson to nail Pagan with a lengthy sentence Wednesday as she tearfully described the depth of her grief.

“Do you know what it feels like to have the center of your universe ripped away from you?” she asked. “I will never again know happiness without pain.”

Janine Donovan repeatedly blasted the court system for giving Pagan breaks on sentences in exchange for his cooperation in the past. “How many deals can one man get?” she asked.

Judge John Gleeson told her that the system of using cooperators and cutting them breaks was an “unpretty” but necessary aspect of the legal justice system.

With a room packed with glaring members of the Donovan clan, Pagan briefly expressed his remorse.

“There are no words that will take away the pain,” he said. “I want you to know I am truly sorry for causing this pain.”

Gleeson – who could have sentenced Pagan to time served of 40 months – ​gave Pag​​an with 11 years.